Yes bulls do go moo just like other cows do.
A bull in reality is just a different type of cow and does moo like the other cows do.
However a bulls moo may be a different tone sometimes than a regular cows moo.
So you should hear a moo but it might sound just a little bit different than a regular cows moo.
You can usually discern the moos between a cow and a bull.
You just have to listen to a regular cow moo and then listen to the bulls moo and then you can easily tell the difference.